Bài giảng Chapter 5: Transport Layer UDP and TCP

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Chapter 5: Transport Layer UDP and TCP. Overview of Transport Layer, UDP Protocol, UDP Protocol, types of data deliveries, port numbers, IP addresses versus port numbers, IANA ranges, socket, address, Multiplexing and demultiplexing, error control, position of UDP, TCP, and SCTP in TCP/IP suite.

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Nội dung Text: Bài giảng Chapter 5: Transport Layer UDP and TCP

Chapter 5 Transport Layer: UDP and TCP 1
Outline  Overview of Transport Layer  UDP Protocol  TCP Protocol 2
PROCESSTOPROCESS DELIVERY The transport layer is responsible for processto process delivery—the delivery of a packet, part of a message, from one process to another. Two processes communicate in a client/server relationship, as we will see later. 3
Note The transport layer is responsible for process-to-process delivery. 4
Note The transport layer tasks include: 5
Types of data deliveries 6
Port numbers 7
IP addresses versus port numbers 8
IANA ranges 9
Socket address 10
Multiplexing and demultiplexing 11
Error control 12
Position of UDP, TCP, and SCTP in TCP/IP suite 13
USER DATAGRAM PROTOCOL (UDP) The User Datagram Protocol (UDP) is called a connectionless, unreliable transport protocol. It does not add anything to the services of IP except to provide processtoprocess communication instead of hostto host communication. Topics discussed in this section: WellKnown Ports for UDP User Datagram Checksum UDP Operation Use of UDP 14
Wellknown ports used with UDP 15
Example In UNIX, the wellknown ports are stored in a file called /etc/services. Each line in this file gives the name of the server and the wellknown port number. We can use the grep utility to extract the line corresponding to the desired application. The following shows the port for FTP. Note that FTP can use port 21 with either UDP or TCP. 16
Example (continued) SNMP uses two port numbers (161 and 162), each for a different purpose, as we will see in Chapter 28. 17
User datagram format 18
Note UDP length = IP length – IP header’s length 19
Pseudoheader for checksum calculation 20